Answer
First of all do counselling.REFER Q 18 FOR CONFLICT MGMT THEORY Find any problem with job factor or personal factor ?
If it is job related , he is not competent then provide training for him. If he thinks that he is senior than me then advice him as per smsce is overall responsible for engine room safety and maintenance.
If he has problem at home then do counseling.
Take rounds of eroom and ask him job assigned to personal.
Inform the mater about his attitude and give warning to him.
Even if after he is not co operating then inform company in written format.